Uninterrupted switching circuit device and system

Abstract

A uninterrupted switching circuit includes a control unit, a first connector, and at least two second connectors. The first connector is configured to be connected to a target device, and the at least two second connectors are respectively configured to be connected to power supply devices. The first connector is connected to the at least two second connectors, respectively, to enable the power supply devices to supply power to the target device through the first connector. The control unit is connected to the first connector and the at least two second connectors, respectively. The control unit is configured to determine whether another power supply device connected to the target device through one of the second connectors is normal, and the control unit is configured to feed back a normal power supply signal to the target device, thereby avoiding an abnormality alarm from being issued by the target device.

What is claimed is: 
     
         1 . A uninterrupted switching circuit comprising:
 a control unit;   a first connector; and   at least two second connectors; wherein:
 the first connector is configured to be connected to a target device, and the at least two second connectors are respectively configured to be connected to power supply devices; 
 the first connector is connected to the at least two second connectors, respectively, to enable the power supply devices to supply power to the target device through the first connector; 
 the control unit is connected to the first connector and the at least two second connectors, respectively; 
 the control unit is configured to, in response to detecting that the target device is disconnected from one of the power supply devices, determine whether another power supply device connected to the target device through one of the second connectors is normal, and, in response to determining that the power supply is normal, the control unit is configured to feed back a normal power supply signal to the target device, thereby avoiding an abnormality alarm from being issued by the target device. 
   
     
     
         2 . The uninterrupted switching circuit according to  claim 1 , wherein the first connector is respectively connected to the at least two second connectors and the control unit through power supply paths and communication paths. 
     
     
         3 . The uninterrupted switching circuit according to  claim 2 , wherein:
 the control unit, the first connector, and each of the second connectors are each provided with a power interface, a first communication interface, and a second communication interface;   a power interface of the first connector and a power interface of each of the second connectors are connected to form power supply paths, and a power interface of the control unit is connected to the power supply paths;   the communication paths comprise first communication paths and second communication paths;   a first communication interface of the first connector and a first communication interface of each of the second connectors are connected to form the first communication paths, and a first communication interface of the control unit is connected to the first communication paths; and   a second communication interface of the first connector and a second communication interface of each of the second connectors are connected to form the second communication paths, and a second communication interface of the control unit is connected to the second communication paths.   
     
     
         4 . The uninterrupted switching circuit according to  claim 2 , wherein:
 the control unit, the first connector, and each of the second connectors are each further provided with an identification interface;   an identification interface of the first connector and an identification interface of each of the second connectors are connected to form identification paths, and an identification interface of the control unit is connected to the identification paths.   
     
     
         5 . The uninterrupted switching circuit according to  claim 2 , further comprising a protection circuit on power supply paths between the first connector and each of the second connectors. 
     
     
         6 . The uninterrupted switching circuit according to  claim 5 , further comprising a diode between each of the protection circuits and the first connector, wherein an input terminal of the diode is connected to an output terminal of the respective protection circuit, an output terminal of each diode is connected to a common node on the respective power supply path and then connected to the first connector, wherein the common node is a node where the power interface of the first connector and the power interfaces of the at least two second connectors are connected to form the power supply path. 
     
     
         7 . The uninterrupted switching circuit according to  claim 6 , further comprising a level detection circuit connected in series between each of the protection circuits and the corresponding diodes, wherein each of the level detection circuits is electrically connected to the control unit. 
     
     
         8 . The uninterrupted switching circuit according to  claim 6 , further comprising a current detection circuit provided between the common node and the first connector, wherein the current detection circuit is electrically connected to the control unit. 
     
     
         9 . The uninterrupted switching circuit according to  claim 8 , wherein the power interface of the control unit is connected to a common terminal between the first connector and the common node, a voltage transformation circuit is provided between the common terminal and the control unit, and an output terminal of the voltage transformation circuit is connected to the control unit via a voltage stabilization circuit. 
     
     
         10 . The uninterrupted switching circuit according to  claim 3 , further comprising a communication protocol conversion circuit, wherein one end of the communication protocol conversion circuit is connected to the first communication paths, and the other end thereof is connected to the control unit. 
     
     
         11 . The uninterrupted switching circuit according to  claim 3 , wherein the first communication paths adopt CAN bus communication, and a terminal resistance self-matching circuit is provided on the first communication path. 
     
     
         12 . The uninterrupted switching circuit according to  claim 1 , further comprising indicators corresponding in number to the at least two second connectors, wherein the indicators are connected to the control unit and are configured to indicate a power supply status of the second connectors. 
     
     
         13 . A target device comprising the uninterrupted switching circuit according to  claim 1 . 
     
     
         14 . A system comprising the target device according to  claim 13  and at least two power supply devices, wherein the target device is connected to each of the power supply devices through the uninterrupted switching circuit.